Mark,
I assumed being a 408 that it might have been S3/SC3 but obviously not, some Jensen's had piper motors as well but finding a wiring diagram is probably equally difficult. I have never been able to get the passengers door window to work from the switches but a few months ago having effectively hot wired the seat controls on a range rover classic using more modern and simple 6 pin window switches I intend all going according to plan to rewire the passengers door window motor to operate independently from a new switch in that door, if the 408 is wired the same as a Silver Shadow its far too complicated when it gets old, though I am sure there are some around who understand the electrics of it perfectly. Sorry can't be of more help.
Geoff.
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